TheGameSite: Tips, Cheats, Walkthroughs: N64: California Speed

CHANGE FOG COLOR

Select a Single or Practice race, then press and hold L, R, Down on the Control Pad and all four C buttons. Once a track fully appears, release all buttons, then press Right on the Control Pad to cycle through all the courses at least once. Choose a track, highlight Mirror, then press Right on the Control Pad three times.